package geniusweb.profilesserver;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;

import org.junit.Before;
import org.junit.Test;

import com.fasterxml.jackson.databind.ObjectMapper;

import geniusweb.profile.Profile;
import geniusweb.profile.utilityspace.LinearAdditiveUtilitySpace;
import geniusweb.profilesserver.events.ChangeEvent;
import geniusweb.profilesserver.events.DomainChangeEvent;
import geniusweb.profilesserver.events.ProfileChangeEvent;
import tudelft.utilities.files.FileInfo;
import tudelft.utilities.files.FileWatcher;
import tudelft.utilities.immutablelist.Tuple;
import tudelft.utilities.listener.Listenable;
import tudelft.utilities.listener.Listener;
import tudelft.utilities.logging.Reporter;

/**
 * Most tests are using a (copy of ) a real filesystem repository. This is
 * because the AutoUpdatingProfilesFactory accesses the real filesystem that we
 * can't properly mock.
 * 
 */
public class AutoUpdatingProfilesFactoryTest {
	private static final String JOBS = "jobs";
	private static final String JOB1 = "jobs/jobs1";
	private final Path REPO_DIRECTORY = Paths
			.get("src/main/webapp/domainsrepo/");
	private List<String> warnings;
	private Path copyrepodir;
	private AutoUpdatingProfilesFactory factory;
	private final long HIGHRATE = 500; // fast so that we can test quickly.
	private final List<ChangeEvent> changes = new LinkedList<>();

	@Before
	public void before() throws IOException, URISyntaxException {
		final Path dir = Files.createTempDirectory("profilestest");
		copyrepodir = Paths.get(dir.toString(), "repo");
		copyFolder(REPO_DIRECTORY, copyrepodir);

		System.out.println("copy placed in " + copyrepodir);
		Reporter logger = new Reporter() {

			@Override
			public void log(Level level, String string, Throwable e) {
				if (level.intValue() >= Level.WARNING.intValue()) {
					warnings.add(string);
				}
			}

			@Override
			public void log(Level level, String string) {
				if (level.intValue() >= Level.WARNING.intValue()) {
					warnings.add(string);
				}
			}

		};

		factory = new AutoUpdatingProfilesFactory(logger) {

			@Override
			protected Path getRootDir() {
				return copyrepodir;
			}

			@Override
			protected Listenable<Tuple<FileInfo, FileInfo>> getFileWatcher(
					File file) {
				return new FileWatcher(file, HIGHRATE - 100, 2);
			}

		};

		factory.addListener(new Listener<ChangeEvent>() {

			@Override
			public void notifyChange(ChangeEvent evt) {
				changes.add(evt);
			}
		});

		warnings = new LinkedList<>();

	}

	/**
	 * test loading the repo
	 */
	@Test
	public void loadRepoTest() throws InterruptedException {
		assertEquals(Collections.EMPTY_LIST, warnings);
		assertNotNull(factory.getDomain(JOBS));
		assertNotNull(factory.getProfile(JOB1));

	}

	@Test
	public void getDomainsTest() {
		assertEquals(2, factory.getDomains().size());
		assertEquals(JOBS, factory.getDomains().get(0));
		assertEquals("7issues", factory.getDomains().get(1));

	}

	@Test
	public void removeProfileTest() throws InterruptedException {

		copyrepodir.resolve("jobs/jobs1.json").toFile().delete();
		Thread.sleep(HIGHRATE);

		assertEquals(1, changes.size());
		assertTrue(changes.get(0) instanceof ProfileChangeEvent);
		assertEquals(Collections.EMPTY_LIST, warnings);
		assertNotNull(factory.getDomain(JOBS));
		assertNull(factory.getProfile(JOB1));
	}

	@Test
	public void removeDomainTest() throws InterruptedException {

		copyrepodir.resolve("jobs/jobs.json").toFile().delete();
		Thread.sleep(HIGHRATE);

		assertEquals(3, changes.size());
		assertTrue(changes.get(0) instanceof ProfileChangeEvent);
		assertTrue(changes.get(1) instanceof ProfileChangeEvent);
		assertTrue(changes.get(2) instanceof DomainChangeEvent);
		assertEquals(1, warnings.size()); // jobs domain file missing
		assertNull(factory.getDomain(JOBS));
		assertNull(factory.getProfile(JOB1));

	}

	@Test
	public void renameDomainTest() throws InterruptedException {

		assertTrue(copyrepodir.resolve(JOBS).toFile()
				.renameTo(copyrepodir.resolve("otherjobs").toFile()));
		Thread.sleep(HIGHRATE);

		assertEquals(3, changes.size());
		assertTrue(changes.get(0) instanceof ProfileChangeEvent);
		assertTrue(changes.get(1) instanceof ProfileChangeEvent);
		assertTrue(changes.get(2) instanceof DomainChangeEvent);
		assertEquals(1, warnings.size()); // wrong domain file, wrong profile
		assertNull(factory.getDomain(JOBS));
		assertNull(factory.getProfile(JOB1));
		assertNull(factory.getDomain("otherjobs"));
	}

	@Test
	public void addProfileTest() throws InterruptedException, IOException {
		LinearAdditiveUtilitySpace profile = (LinearAdditiveUtilitySpace) factory
				.getProfile(JOB1);
		Profile newprofile = new LinearAdditiveUtilitySpace(profile.getDomain(),
				"jobs9", profile.getUtilities(), profile.getWeights(),
				profile.getReservationBid());

		ObjectMapper jackson = new ObjectMapper();
		BufferedWriter writer = new BufferedWriter(new FileWriter(
				copyrepodir.resolve("jobs/jobs9.json").toFile()));
		writer.write(jackson.writeValueAsString(newprofile));
		writer.close();

		Thread.sleep(HIGHRATE);

		assertEquals(1, changes.size());
		assertTrue(changes.get(0) instanceof ProfileChangeEvent);
		assertTrue(warnings.isEmpty());
		assertNotNull(factory.getProfile("jobs/jobs2"));
	}

	/**
	 * We add domain as jobs8 but it has internally the name jobs9.
	 */
	@Test
	public void addWrongProfileTest() throws InterruptedException, IOException {
		LinearAdditiveUtilitySpace profile = (LinearAdditiveUtilitySpace) factory
				.getProfile(JOB1);
		Profile newprofile = new LinearAdditiveUtilitySpace(profile.getDomain(),
				"jobs9", profile.getUtilities(), profile.getWeights(),
				profile.getReservationBid());

		ObjectMapper jackson = new ObjectMapper();
		BufferedWriter writer = new BufferedWriter(new FileWriter(
				copyrepodir.resolve("jobs/jobs8.json").toFile()));
		writer.write(jackson.writeValueAsString(newprofile));
		writer.close();

		Thread.sleep(HIGHRATE);

		// the bad profile should be completely ignored but we should get
		// warnings.
		assertEquals(0, changes.size());
		assertEquals(1, warnings.size());
	}

	/**
	 * We remove jobs domain.
	 */
	@Test
	public void removeRootdirTest() throws InterruptedException, IOException {
		assertNotNull(factory.getDomain(JOBS));

		delete(copyrepodir.resolve(JOBS).toFile());
		Thread.sleep(HIGHRATE);

		assertNull(factory.getDomain(JOBS));
		assertNull(factory.getProfile(JOB1));

		assertEquals(3, changes.size());
		assertTrue(changes.get(0) instanceof ProfileChangeEvent);
		assertTrue(changes.get(1) instanceof ProfileChangeEvent);
		assertTrue(changes.get(2) instanceof DomainChangeEvent);
		assertEquals(0, warnings.size());
	}

	/**
	 * Copy files and all sub-files.
	 * 
	 * @param source
	 * @param dest
	 */
	private void copy(Path source, Path dest) {
		try {
			Files.copy(source, dest);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private void copyFolder(Path src, Path dest) throws IOException {
		Files.walk(src).forEach(
				source -> copy(source, dest.resolve(src.relativize(source))));
	}

	/**
	 * recursively delete file and all subfiles.
	 * 
	 * @param f the file to be deleted. can be directory.
	 * @throws IOException if file can't be deleted. This halts the delete
	 *                     procedure immediately.
	 */
	private void delete(File f) throws IOException {
		if (f.isDirectory()) {
			for (File c : f.listFiles())
				delete(c);
		}
		if (!f.delete())
			throw new FileNotFoundException("Failed to delete file: " + f);
	}
}